I'm assuming that the latter (an insulated bag) would be a distinct subset of the former (an objectively more popular bag).

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The opinions of Doctor No do not necessarily represent the opinions of mathematicians or consulting actuaries. Facts cited by Doctor No are not necessarily facts. Find me on Twitter: @NorrisDoug. If you send me a LinkedIn invitation, please let me know who you are (unless it's obvious how I know you).

Then again, I have no idea what a mAh is or how much I actually need so maybe it's fine just for a cell phone, which is enough to be useful. I just noticed that the ones on Amazon are 20,000 mAh or more.

this link has a table in it that supposedly shows you how big the batteries are in various phones/tablets. no idea if it's accurate, but it looks like 4000 mAh is at least enough to give today's phones one full charge. and it's a free gift, so that's better than nothing.